G 3500 1 Ton Van V8-379 6.2L DSL VIN J FI (1992)
Blower Motor: Description and Operation
Auxiliary Heater
The Blower Motor delivers air to the interior of the vehicle. Its speed is controlled by the Blower Switch an the Blower resistor. Note that the Blower
Switch provides ground to the Blower Resistors rather than battery voltage as in most common systems. When the Ignition Switch is in RUN, battery
voltage is supplied to the Blower Motor. With the Blower Switch in LO, voltage is supplied across both Blower Resistors and the Blower Motor. The
Blower Motor runs at its slowest speed. With the Blower Switch in MED, one of the Blower Resistors is bypassed and the Blower Motor runs faster.
When the Blower Switch is set to HI, direct ground is provided to the Blower Motor and the Blower Motor runs at its fastest speed.